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The MCP251xFD has a dedicated transceiver standby control function on the INT0/GPIO0/XSTBY pin, controlled by the XSTBYEN bit in IOCON. When enabled, the hardware automatically manages the transceiver standby state: the pin is driven low when the controller is active and high when it enters Sleep mode. Enable this feature when the 'microchip,xstbyen' device tree property is present. Signed-off-by: Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com> Link: https://patch.msgid.link/20260321135031.3107408-3-viken.dadhaniya@oss.qualcomm.com Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>